Compatible : Such as Fan, Table Lamp, Solar Panel, USB Power Pack, Power Adapter, Bluetooth Audio, Wireless Router, Speakers & More that requires for 12V power Safe & Reliable : - Built-in upgraded intelligent IC circuit - Perfect protecetion from over-current, over voltage, overload or short circuit - Can be used to power the router via power bank if power down Product Parameters : USB Input 5V 2A DC Output 12V Max Current 1A The size of the DC Connector OD: 5.5 mm & ID: 2.1 mm, Inner Positive( ) polarity, Outside negative(-) polarity.